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Summary of Marketable Securities (Detail) (USD $) In Thousands, unless otherwise specified | Jan. 31, 2015 | Apr. 30, 2014
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Schedule Of Marketable Securities [Line Items] |  |  |  |
Trading | $ 133,655 us-gaap_TradingSecurities | [1],[2] | $ 116,207 us-gaap_TradingSecurities | [1],[2]
Less: current portion of marketable securities | (13,077)us-gaap_OtherMarketableSecuritiesCurrent | [1],[2] | (4,510)us-gaap_OtherMarketableSecuritiesCurrent | [1],[2]
Non-current marketable securities | 120,578 us-gaap_OtherMarketableSecuritiesNoncurrent | [1],[2] | 111,697 us-gaap_OtherMarketableSecuritiesNoncurrent | [1],[2]
Available-for-Sale | 15,214 us-gaap_AvailableForSaleSecuritiesDebtSecurities | [2] | 18,352 us-gaap_AvailableForSaleSecuritiesDebtSecurities | [2]
Less: current portion of marketable securities | (15,214)us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent | [2] | (5,056)us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent | [2]
Non-current marketable securities |  |  | 13,296 us-gaap_AvailableForSaleSecuritiesDebtSecuritiesNoncurrent | [2]
Total | 148,869 us-gaap_MarketableSecurities |  | 134,559 us-gaap_MarketableSecurities |
Less: current portion of marketable securities | (28,291)us-gaap_MarketableSecuritiesCurrent |  | (9,566)us-gaap_MarketableSecuritiesCurrent |
Non-current marketable securities | 120,578 us-gaap_MarketableSecuritiesNoncurrent |  | 124,993 us-gaap_MarketableSecuritiesNoncurrent |
Mutual Funds |  |  |  |
Schedule Of Marketable Securities [Line Items] |  |  |  |
Trading | 133,655 us-gaap_TradingSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = kfy_MutualFundsMember | [1],[2] | 116,207 us-gaap_TradingSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = kfy_MutualFundsMember | [1],[2]
Total | 133,655 us-gaap_MarketableSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = kfy_MutualFundsMember |  | 116,207 us-gaap_MarketableSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = kfy_MutualFundsMember |
Corporate Bonds |  |  |  |
Schedule Of Marketable Securities [Line Items] |  |  |  |
Available-for-Sale | 15,214 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember | [2] | 18,352 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember | [2]
Total | $ 15,214 us-gaap_MarketableSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember |  | $ 18,352 us-gaap_MarketableSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember |
[1] | These investments are held in trust for settlement of the Company's vested and unvested obligations of $127.8 million and $117.6 million as of January 31, 2015 and April 30, 2014, respectively, under the ECAP (see Note 6 - Deferred Compensation and Retirement Plans). During the three months ended January 31, 2015, the fair value of investments decreased; therefore, the Company recognized a loss of $0.2 million, which was recorded in other (loss) income, net. For the nine months ended January 31, 2015, the fair value of the investments increased; therefore, the Company recognized income of $4.3 million, which was recorded in other (loss) income, net. During the three and nine months ended January 31, 2014, the fair value of the investments increased; therefore, the Company recognized income of $1.2 million and $7.6 million, respectively, which was recorded in other (loss) income, net.
[2] | The Company's financial assets measured at fair value on a recurring basis include trading securities classified as Level 1 and available-for-sale securities classified as Level 2. As of January 31, 2015 and April 30, 2014, the Company had no investments classified as Level 3.

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